Peters



(No Model.)

T. MAXON.

LIPTING JACK.

N0. 306,341. Patented Oct. 7, 1884.

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THOMAS MAXON, OF DAYTON, OHIO, ASSIGNOR OF ONE-HALF TO JAMES WV. CARPENTER, OF SAME PLACE.

Marmo-JACK@ SPECIFICATION forming part of Letters Patent No. 306,341, dated October 7, 1384.

Application filed July 5 Ohio, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specicatiomreference being had therein to the accompanying drawings.

My invention relates to certain improve ments in lifting-jacks, and is designed to produce a strong, durable, and efficient device for raising objects of greater or less weight through a limited distance.

The improvements consist, essentially,in the clutch embracing the ratchet-bar, and the peculiar arrangement and combination of the various parts.

In describing the device, reference will be had tothe annexed drawings representing the 2o jack, and in which- Figure 1 is a side elevation with one-half the frame removed Fig. 2, a detail of the clutch; Fig. 3, a detail of one of the handlesupporting links, and Fig. 4 a modilication of the clutch.

A designates a rack-bar having teeth on one side, and provided with a head, B; and aprojecting foot, C. On each side of the bar is a longitudinal groove, D, and parallel with it is one E at the butt of the projecting foot. The grooves E guide the bar in the frame G by means of the tongue F, cast thereon. This frame is constructed of two parts or halves, and has a base, H, for supporting it. The two parts are secured together by bolts, and when so secured are arranged to allow the vertical passage of the projecting foot. On each part near the top is a tongue, I, which engages in the grooves D on the bar and aids in guiding it. The upper end of the frame also containsapivoted spring-actuated retaining-pawl, K. A clutch, L, operates in the lower part of the frame, and is pivotally supported at its lower end by the handle-socket M. The clutch has win gs N passing on each side ofthe ratchetbar, and the ends ofthe said wings have tongues O on them adapted to engage in the longitudinal groove in the said bar.

In Fig. l the clutch is slotted on its side,

o and carries pivoted therein a spring-actuated pawl, l?, similar to the one K.

(No model.)

In Fig. 4: a gravity-pawl, R, is used having one side inclined, as shown, and the other with notches to fit in and engage with the teeth on the rack-bar. The clutch is continued outward, forming an inclined casing, S, to con-` tain' the pawl R, so that as it is moved downward the said pawl will move outward and disengage from the rack-bar, and when it is moved upward the pawl will engage with and lift the bar. On each side of the clutch is raised a lug, T, which assists in guiding the said clutch and prevents cramping the same. The handle-socket M has one end straddling the projection U on the clutch, and is there pivoted, and is supported by links V,pivoted to the upper portion of the frame, thereby allowing the said handle to have a certain swing 7 necessary for it to accommodate itself to the clutch,which has a vertical movement only. The sides ofthe clutch bear against the inner sides of the casing. As the handle is operated to elevate the bar the pawl engages in the teeth on the bar, while the tongues on the wings or sides ofthe clutch clamp against the sides of the grooves in the bar. The pawl acting as a fulcrum, the pressure on the handle accomplishes this object, and thereby the strain is not broughtl directly on one point, but is distributed to several points of contact, thus reducing the danger of rupturing any of the parts, and increasing the durability ofthe entire device.

Having described the device, what I claim 1sl. In a lifting-jack, a clutch pivoted to ahandle and carrying a pawl, the said clutch embracing the lifting-bar of the jack, so as to move in about a vertical direction.

2. In a lifting-jack, a clutch pivoted to a handle and carrying a pawl, the said clutch having its sides or wings embracingthe rackbar of the jack provided with tongues adapted to travel in alongitudinal groove on each side of the said bar.

3. A handle-socket pivoted at one end to a movable clutch containing an elevating-pawl, the said socket being hung on swinging links to give it proper lateral motion.

4. A rack-bar provided with a head and projecting foot, and having a longitudinal groove through nearly its entire length on each IOO side, and a parallel groove on each side ofthe foot.

5. A divided easing provided with a broad base, and having a tongue near the top of each 5 piece, and one at the side thereof, in combination with a rack-bar having in it grooves in which the tongues fit.

6. In a lifting-jack, a divided casing provided with guiding-tongues, a rack-bar pro- Io vided with grooves in which the said tongues it, a'olutoh carrying a pawl and embracing the bar, and having tongues to t in one of THOMAS MAXON.

Witnesses:

WEBSTER W. SHUEY, CHARLns DAvis. 

